GATE ME 2022 Set 1 — Question 43

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MCQ+2 / -0.67MediumViscous Incompressible FlowViscous & Pipe FlowFluid Mechanics

Fluid Mechanics → Viscous & Pipe Flow → Viscous Incompressible Flow

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Question

A solid spherical bead of lead (uniform density = 11000 kg/m311000 \text{ kg/m}^3) of diameter d=0.1 mmd = 0.1 \text{ mm} sinks with a constant velocity VV in a large stagnant pool of a liquid (dynamic viscosity = 1.1×103 kgm1s11.1 \times 10^{-3} \text{ kg}\cdot\text{m}^{-1}\cdot\text{s}^{-1}). The coefficient of drag is given by cD=24Rec_D = \frac{24}{Re}, where the Reynolds number (ReRe) is defined on the basis of the diameter of the bead. The drag force acting on the bead is expressed as D=(cD)(0.5ρV2)(πd24)D = (c_D)(0.5\rho V^2)\left(\frac{\pi d^2}{4}\right), where ρ\rho is the density of the liquid. Neglect the buoyancy force. Using g=10 m/s2g = 10 \text{ m/s}^2, the velocity VV is __________ m/s.
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